<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>

</head>

<body>

    <button type="button" class="btn btn-primary" onclick="showdevices()">
        获取设备
    </button>
    <div>
        <p id="devices"></p>
    </div>
    <script type="text/javascript" src="./js/checkdevice.js"></script>
</body>

</html>
